Ments



TE STATES PAINT @FFTCE.

GEORGE H. GIL'MAN, 0F CLAREIVIONT, NEW HAMPSHIRE, ASSIGNORJBY MESNE ASSIGN- MENTS, T0 SULLIVAN MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, A COR,-

PORATION OF MASSACHUSETTS.

PUMY-DRILL.

Specification of Letters Patent.

Application filed July 25, 1911. Serial No. 640,475.

To all whom it may concern:

Be it known that I, GEORGE H. GILMAN, a citizen of the United States, and a resident of Claremont, county of Sullivan, State of New Hampshire, (whose post-office address is Clar'emont, New Hampshire,) have invented an Improvement in Pump-Drills, of which the v following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to rock drills and more particularly to the class of drills known as pump drills or pump drill steels wherein the drill steel is equipped with devices to cause the cutting end thereof to act as the piston of a pump expelling the water and the cuttings from the drilled hole simultaneously with the cutting operation. The

action of such pump steels has heretofore required the application of devices extraneous to the steel so that the said devices tend to interfere more or less with the drilling action and also tend to become detached, disengaged or broken under the severe pounding action which the cutter receives.

The object of the present invention is to construct a pump drill in such a mechanically perfect form that the full eifective cutting action of the cutter can be had and at the same time there can be obtained a more effective mechanical construction wherein the parts have no chance for displacement or detachment.

The invention will be best understood by reference to the following description when taken in connection with the accompanying illustration of one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

In the drawings: Figure 1 is a section'on an enlarged scale of the cutter and .the associated valve for a pump steel embodying one form of my invention; Fig. 2 is a side elevation of a rock drill equipped with a pump steel shown in Fig. 1 illustrating the rigid connection of the cutter to the drill piston; Fig. 3 is a view partly in section showing the rigid connection of the cutter to the piston rod of the drill; Fig. 4 is a plan view in section on the line 44 in- Fig. 1; Fig. 5 is a plan in section on the line 55 in Fig. 1; and Fig. 6 is a sectional plan taken through the locking bushing.

Referring to the drawings and to the suitable passage in the cutter.

embodiment of the invention illustrated therein, in Fig. 2 I have shown arock drill l mounted upon a tripod 2. The rock drill may be of any suitable or usual construction, being provided with the piston 3 and the attached piston rod l, the latter being connected through the rigid connection or shank 5 with the cutting bit 6. The drill may be used with steam or compressed air so that, as is usual in this class of devices,

the cutter bar is rapidly reciprocated through the motor driven action of the piston 3.

During the cutting action of the butter 6 the drilled hole as shown in Fig. 3

tween the passages 8 and 9 and upon a seat presented by the upper end of the cutter.

The upper end of the cutter bit has a reduced threaded end 11 which is engaged with a correspondingly threaded opening in the end of the connection 5 so that the cutter bit can be screwed tightly into the con nection bringing the end of the latter against the shoulder between the reduced portion of the cutter and its portion of larger diameter. By this means the cutter and the connection form in eflect a single integral piece incapable of being detached except by unscrewing one from the other. The ball-valve 10 is contained within the metal cage 12 which latter has a flange clamped between the bit and the connection, and, together with the ball valve, is slipped into place before the cutter bit is applied.

To prevent the cutter bit from unscrewing, a locking device is applied thereto after the bit has been fastened to the connection. Such locking device is preferably in the form of a bushing 13 giving to the pump steel when 00 plete a substantially compact cylindrical formation throughout with no projecting parts. The bushing is provided with an inwardly projecting tooth 14: opposite the underlying portion of the connection 5 and a second but oppositely 1nclined tooth 15 opposite the underlying portion of the cutter bit 6. These teeth may-be conveniently formed by cutting out a U- shaped part of the bushing and bending the same inwardly. 'The tooth 14 is adapted to engage-with one of a plurality of notches or grooves 16 formed in the periphery of the connection 5, the notches belng so formed that the locking bushing or sleeve cannot be turned in the direction of the arrow shown in Fig. 4:. Similarly the tooth 15 is adapted to engage with one of a plurality of grooves or notches 17 formed in' the periphery of the cutter bit 6 so that the cutter bit cannot be turned in the direction of the arrow as shown in Fig. 5 without also turning the sleeve. When the cutter bit 1s applied to the connection the sleeve is placed upon the latter as shown in Fig. 4 and the cutter bit then screwed into place. As the bit is being turned thetooth 15 slips over the notches 17 snapping into place in one of the notches when the cutter bit is finally screwed up tight. In that position it looks the bit for the latter cannot be turned except by turning the sleeve in the direction of the arrow and the sleeve is locked against movement in that direction. a

For dismantling the apparatus the parts can be unlocked by utilizing any suitable tool to drive the sleeve up on the shank of the connection. For this purpose the outside diameter of the connection is approximately the same as the inside diameter of the sleeve. The upper ends of the grooves or notches 16 are beveled at 16 as are the ends of the notches 17 at 17, so that when the sleeve is driven back upon the shank of the connection the tooth slides out at the beveled end of one of the notches.

The connection 5 may be secured to the piston rod 4 byany suitable or usual chuck.

Herein the lower end of the piston.rod receives the bushing 18 one side of which is cut away to receive the clamping block 19 bearing against the end of the connection 5, the block being clamped into position by the U-shaped clamp 20. In order to provide for the discharge of water and the sludge the axial passage/Q is continued through the chuck into the end of the piston rod Whereat it communicates'with the lateral discharge passage 21.

The operation of the described pump drill will be obvious. As pressure fluid is admitted to the drill cylinder to drive the piston forward, the cutter is forced against the bottom of the hole and makes the required out. At the same time the water, sludge and cuttings at the bottomof the hole are agitated and a portion of the mass forced up through the axial passage 8, lifting the ball valve and passing up through the passage 9.

As the piston is reversed the cutter is lifted and the valve seats. The continuance of this operation causes a stream of Water and cuttings to pass up through the connection 5 through the chuck and out of the lateral opening :21 whence they can be conveyed to any required point. During the operation of the drill therefore the latter acts as a port pump not only sinking the hole but forcing the water and cuttings through the cutter and out of the chuck.

It will be seen that the described form of pump steel is extremely compact while at the same time mechanically strong and effective. The rigid connection between the valve carrying end of the cutter and the piston in the tool provides that the full power of the motor is available at all times for pumping or forcing out the cuttings from the hole, this being done most effectively through the axial passage as described.

While for purposes of illustration I have herein shown and described one specific form of the invention, it is to be understood that the same is submitted for illustrative purposes'only and that extensive deviations may be made therefrom without departing from the spirit of the invention.

Claims:

1. In a rock drill the combination with a drill steel, a reciprocatory piston and piston rod, a chuck for connecting in axial alinement said piston rod and'said drill steel to. transmit the reciprocatory movement of said piston rod to said drill steel, an axial conduit extending from the cutting end of said drill steel to said chuck, a piston conduit adjacent saidchuck having a lateral discharge opening above said chuck, and a valve in said axial conduit for utilization of the reciprocatory movement of said drill steel to cause upward flow of fluid through said axial conduit and said piston conduit to said lateral discharge opening above said chuck.

2. In a rock drill the combination With a drill steel, a reciprocatory piston and piston rod, a chuck for connecting in axial alinement said piston rod and said drill steel to transmit the reciprocatory movement of said piston rod to said drill steel, an axial conduit extending from the cutting end of said drill steel "to said chuck, a piston conduit adjacent said chuck havinga downwardly discharging lateral discharge opening above said chuck, and a valve in said axial conduit for utilization of the recipro catory movement of said drill steel to cause upward flow of fluid through said axial conduit and said piston conduit to said lateral drill steel comprising a shank portion, a separable bit, a longitudinal aperture in said shank portion and said bit, a valve operatively interposed in said aperture and removable by separation of said shank portion from said bit, a chuck to connect said piston rod and said shank portion, and an aperture through said chuck connecting with said longitudinal aperture and permitting the discharge of fiuid from said longitudinal aperture at a point above the lower extremity of said chuck.

4. A rock drill having a drill tool provided with a piston and piston rod, 'a cutter, a rigid connection between the cutter and the piston rod with which the said cutter has threaded engagement, a valve controlled passage in said cutter and connection, and a sleeve encircling said cutter'and connection and having a locking device for locking said cutter to said connection.

5. A rock drill having a drill tool pro vided'with a piston and piston rod, a cutter, a rigid connection between the cutter and the piston rod. with which the said cutter has threaded engagement, a valve controlled passage in said cutter and connection, and a locking bushing encircling the terminal portions of said connection and cutter, and having lateral engaging means for locking said cutter to said connections.

6. A rock drill having a drill tool provided with a cylinder, a piston and a pistonrod, a chuck, a cutter, a rigid connection between the cutter and the chuck and a valve controlled passage in said cutter and the connection, said passage extending through i the chuck to cause the discharge of water and cuttings therethrough between said cylinder and the lower extremity of said chuck. 7. In a rock drill, the combination with a drill tool having its cylinder iston and piston rod, of a cutter bit rigid y connected to the'piston rod, an axial conduit through the cutter bit and the connection, a discharge opening above the connection and below said cylinder and an upwardly opening, automatically-actin check-valve for controlling the passage of uid through said conduit.

8. A rock drill having a drill tool pro-- vided with a cylinder, a piston and a'piston rod, a chuck, a cutter, a rigid'connection between the cutter and the chuck, and a passage in said cutter and the connection, said passage extending throu h the chuck to cause the discharge of th water and outtings therethrough below said cylinder, and

an upwardly-opening automatically-acting check-valve, permitting an upward flow of fluid through said passage but preventing a downward flow ofthe fluid therethrough.

piston rod, of a cutter bit rigidly connected to said piston rod, there being an axial conduit through said cutter bit and the connection having a lateral discharge opening below said cylinder, and an upwardly-opening automatically-acting check-valve for utilizing the vertical reciprocations of said cutter bit to cause an upward flow of the water and cuttings from the cutting edges of said cutter bit through said conduit and the discharge of said water and cuttings through said lateral opening.

10. In a rock drill, the combination with a drill tool having a cylinder, its piston and piston rod, of a cutter bit rigidly connected to said piston rod, there being an axial conduit through said cutter bit and the connection having a downwardly-inclined lateral discharge opening below said cylinder, and an upwardly-opening, automatically-acting check-valve for utilizing the vertical reciprocations of said cutter bit to cause an upward flow of the water and cuttings from the cutting edges of said cutter bit through said conduit and the discharge of said water and cuttings through said lateral openmg.

11. In a rock drill,"the combination with a drill tool having its piston, piston rod, and piston rod guide, of a cutter bit rigidly connected to the piston rod, an axial conduitthrough the cutter bit and the connection having a dis arge opening in the piston rod below the piston rod guide, and a valve for utilizing the reciprocatory movement of the piston rod and cutter bit tocause an upward flow of fluid from said conduit to said discharge opening.

12. In a rock drill, the combination with a drill tool having a piston, piston rod and piston rod guide, of a cutter, a rigid mem ber constituting a connection distinct from and interposed between the cutter and piston rod, an" axial conduit in said connection having a discharge opening above the bottom of said connection and below said piston rod guide, and a valve for utilizing the reciprocatory movement of said piston rod and drill-bit to cause an upward flow of fluid 

